Vacuum tube



G. H. PERRYMA'N VACUUM VTUBE:

Filed April 5, 197274 www) i @Il grid respectively Patented May 27,1930v UNITED STATESIPATENT oil-*FICE GEORGE H. PERBYMAN, 0F WOOIDCL-IFF,NEW JERSEY, ASSIGNOR TO PERRYMAN ELEC- TRIO C0., ING., A CORPORATIONDFDELAWARE VACUUM TUBE Application illed April 5, 1927. Serial No.181,027.

The object of the present invention is to rovide an improved vacuum orthermionic evice, prticularly adapted for radio purposes. improved tubeis so designed as 5 to be readily capable of permitting the heat ing ofits cathode by transformed and stepped down alternating current. Iachieve, this, without any trace of an A. C. hum, by the manner in whichode heated thereby are isolated fromthe anode and grid leads. Through myimproved construction, my improved vacuum tubes may be veryexpeditiously assembled and furthermore, this assembling is such that anextremely rigid and sturdy construction is provided. y Withthese objectsand such other objects as may hereinafter appear, in view, I havedevised the particular arrangement of parts hereinafter set forth andmore particularly pointed out in the 'claims ap ended hereto.

Reference is to be had to t e accompanying drawing, forming a parthereof in which Figure 1 is a vertical sectional view of a my invention.l

Figure 2 is a sectional view on the line 2-2 of Figure 1, looking in thedirection of the arrows,

Figure 3 is a side'elevation of the cathode and attendant parts, with.parts of the cathode beiig broken away to disclose construction anFigure 4 is a view of a modification.

In the embodiment of my invention as disclosed in the accompanyingdrawing, 1 indicates the lower stem of the tube. This stem 1 is providedwith the usual press 2 and formed integral therewith and extendingupwardly therefrom is a projection pr stud 3. Extendin stem 4'w ich actsplate 5. Said anode or plate 5 is of the usual tubular form used in manytypes ofvarious tubes and the same encloses the grid 6. Said grid 6, maybe,*'i f desired, composed of a spirally woundrwire and thesame issupported upon an upright wire or stem 7 The -stems 4 and 7 whichsupport the plate and have their lower ends conto support .the anode or`3 on the stem 2, one which is commonlyv the filament and the cath-lsimilar in ,all respects to vacuum tube constructed in accordance withupwardly from the press 2 is a,

readily apparent.

nected to lead-in wires 8 and 9 which p ass down through the stem 1 andmay be connected to prongs of any desired kind mounted on a base whichhas been omitted for convenience .in illustration.

The structure thus far described is, with the exception of the upwardlyprojecting stud found in the'ordinary` vacuum tube construction.

At 10 is shown an upper stem which is provided with a press 11 andintegrally formed with said press and extending downwardly from4 thesame isa stud 12.` rlhis stud 12 is the stud- 3 on the stem 1. At 13 isshown the cathode which is'preferably formed of a section of metalltubular `in form and oxide coated. Said cathode 13 is of such internaldiameter that its opposite ends fit snugly over the studs 3 vand 12 andserve to bridge or connect the same as is clearly'illustrated in Figure1.

The filament leads are disclosed at 14 and l15 and these leads extenddownwardly through the stern 10, press 11 and into the internal bore ofthe tubular cathode 13.

At 16 is shown a spacing member which is vin the form of a continuouselongated rod of such a diameter as to fit with a sliding iit within thetubular cathode 13. Said member 16 is in the nature of a support and 1tis provided with a ing longitudinally through it. These perforationspermit the passage vof the filament wires indicated wires extend throughthe spacing member 16 and are held rigid and secure therein andconnecttogether at apoint below the end ofthe spacing member 16 as is clearlydisclosed in`Figure 1. y f

From the foregoing, the manner in which my improved tube is constructedwill be The stem 1 with the anode 5 and grid 6 extending upwardly fromit, is assembled in one unit. The upper stem 10 with its parts-composedof the cathode 13, the spacingrod 16 and the filaments 14 and 15 fittedin position as is disclosed in Figure 3, is assembled in another unit.The units thus formed are connected together by simply sliding thecathode 13 down within the grid 'oair o-fperforations extendat 14 and15. The filament from the press 2. When this is and the same passes upthrough the press 2 f 2'0 6 so that the open lower end'of said cathodefits over the stud 3 which extends upwardly done, the entire internalarts of the tube have been connected toget er and furthermore, automa,-

tically hold their positions until the tube envelope 17 is fused aroundthem. This is done by first, fusing the stem 10 to one end of theenvelope and closing that end and then reversing the tube and fusing theopposite end of the envelope 17 to the stem 1. There- I i after, thetube is exhausted and such bases or terminals as are needed, may befitted tothe i tube.

I also provide for a cathode lead which automatically establishesconnection with the cathode 13 when said cathode is being inserted inposition. This cathode lead is shown at 18 and has its upper endterminating in the formof a spring 19. Said'spring part 19 normallytends to bear against the surface ofl the stud 3 and when the cathode 13is inserted within the anode 5 `and vthe grid 6, and said cathode fitsover the stud 3, the end ,of said cathode 13 passes between the lstud 3and spring 19. Said spring 19 therement wires extend out of one end ofthe tub-e and the plate and grid leads out of the other with the resultthat the leads for the filament are spaced away or isolated from theplate i ,and grid leads, sothe possibilityv of an A. C.

. that the lin ,actual use.

Ihum reaching the plate and grid leads is avoided. The filament leads 15tend, when thenecessary current'is applied, to heat the cathode -13 in amanner readily understood. Caps of an type may be fitted to the oppositeends o the tube and the leads 9, 18 and 8 and the lament leads 14 and 15maybe connected to prongs on such caps to' enable the tube to be fittedto sockets provided for them. lThelconstruction of the tube'is suchparts may be made heavy and strong so that a tube oflong life isprovided by the "abilit'y'of the parts of the tubes to withstand shocksand strains either in transportation or In Figure 4' is shown amodification ofmy invention wherein the studs that extend into the-endsof theltubular cathode -13 are separately formed from the stem 1.'lmodification of my invention, thestuds are of metal and fit into thepresses 2 and 11. When this type of construction is used, the lower YNew York, this 2nd -Stud which I have' indicated ac eoin Fi ure Havinginvention, it is obvious that the sameis not to be restricted to theexact embodiment shown, but is broad enough to cover all structurescoming claims.

WhatI claimis:

. 1. In a vacuum tube, an envelope,

stem secured" thereto,l a lowerstem, anode and grid leads extending fromthe lower stem, i

said leads carrying an anode and grid respecf tively, filament leadsextending from the' u per stem, a projection formed on and exten lingvfrom the upper stem, a tubular cathode projection and extending.

fitted over said therefrom, said cathode surrounding the filaan upper'within the scope of the annexed ments,` and a projection on -the lowerstem v over which the lowerend of fitted. v

2. In a vacuum tube, an envelope, stems fixed thereto, an anode and gridwholly supported by one of said stems,- a filament supported by theother stem, saidffilamentthe cathode is` a pair of A .ica

supporting stem being provided with av rojecting stud, a tubular cathodesurroun ing the filament and having one of its ends fitted over saidstud and a similar stud on the other stem over lwhich the opposite end-of the cathode is fitted. j

3. In a vacuum tube, an envelope, a stem attached thereto having anintegrally formed projecting stud, an anode and a grid carried y saidstem, a tubular cathode fitted over said stud and surrounded by theanode and grid, a second stem on the envelope havinga similarly formedstud projecting into the opposite end of the cathode and a filamentcarried by the second stem and projecting into the cathode. v

Signed at the city, county and State of day of April, 1927. G. H.PERRYMAN.

Inthis.'`

